Metallic door



2 Sheets-Sheet 1. W.- R. KINNEAR. METALLIC 13003.

(No Model.)

Patented Jan. 27,1891.

2 Sheets-Sheet 2.-

(No Model.)

W. R. KINNEAR.

METALLIC DOOR.

No. 445262. Patented Jan.27,1891.

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UNITED STATES PATENT' OFFICE.

XVILLIAM R. KINN EAR, Oli COLUMBUS, OHIO.

METALLIC DOOR.

SPECIFICATION forming part of Letters Patent No. 445362, dated. January 27, 1891.

Application filed February 14, 1890. Serial No. 340698. (No model.)

To call whom it may ccncer:

Be it known that I, VVILLIAM R. KINNEAR, a citizen of the United States, and a resident of Columbus, in the county of Franklin and State of Ohio, have invented new and useful Improvenents in Iron Structures, of which the following is a full and exact description, reference being had to the accompanying drawings, making part of this specification.

This invention relates to inprovenents in metallic doors; and it consists in the novel Construction and arrangenent of the parts hereinafter more full y set forth and claimed.

It is the object of this inventon to produee a metallic door which will be light and suitable for use in the finished structure, such as dwelling houses, hotels, &e

In the acconpanying drawings, Figure l is a perspective View of a door constructed in accordance with this invention. Fig. 2 is a detail View in perspective of an upper corner of the door. Figs. 3, 4:, and 5 are detail views in section of the successivo steps in forming the joint of the parts of the door.

The door shown in the drawings is torned in two continuous sections A and B of very light sheet metal, each section forning the entire surface of one side of the door, and the design of panels or other figures is pressed into the metal in such way as to produce the rails O, which are provided to strengthen the Construction and prevent buckling or twisting therein, thus rendering it possible to use the lighter grades of material. These sections are provided with raised fianges A' and B' set up froni their sides to form the edge of the door and a joint between the sections.

To form a snooth surface at the corners of the door the flanges are rounded, as shown at Fig. 2 of drawings. In this forn the accunulated material incident to the formation of a corner in metal is distributed around the area of the curve instead of being crowded into a square corner. This allows for the formation of a comparatively snooth surface on the corners by pressing the metal and compelling it to distribute itself more or less evenly around the corncrs. To make a yet smoother surface at these points after thus forming them I proceed to dress them With a `file. efore thus turning up the flange A' its outer edge is set back to forn the extension a, the purpose of which is to forn a joint in conjnnction with the flangeB' on the section B.

Previous to joining the sections the section A is filled with some material D, such as loose asbestus, mineral wool or like substances to render the structure solid and durable, and prevent the transnission of sound through the door. In some instances I use for a filling a wooden frame, which fills in the rails C and helps to strengthen the Construction, and in cheaper work renders the application of hinges and other door furnishings easier by accomniodatingthe use of Wood-screws instead of the bolts or metal screws which are used in the other constructions. \Vhen the section A is filled, as above stated, section B is placed upon it, with the fiange B' extending np over the extension a, as shown at Fig. 3. The sections are now joined by turning the fiange B' down upon the extension a on all sides, as shown at Fig. l, and then turning the folded fiange and extension into the recessed part of the extension to forn the double loop-joint shown at Fig. 5. Care is taken in this last operation to bring the outer surface of the joint to a flush surface with the flange A', in order to present an even surface on the edge of the completed door. This folded joint has the appearance of an edging-bead, such as is used in Wood constructions.

The door furnishings may be attached to the structure in any of the ordinary ways. When the door is mortised, care is taken to leave an edging of metal that ina-y be turned into the niortise.

Having thus described my nvention, what I claim is- 1. As a new article of nanufacture, a door conposed of sheet-metal sections, each forming the one side of the door, and flanges A' and B', curved at the corners of the door and con nected by a double-told joint, substantially as described. I

2. As a new article of manufacture, a door composed of sheet-metal sections, each forming the one side of the door, fianges A' and B', turned up from the said sections and curved at the corners of the door, and a double-loop connection formed by the fiange B' and extension a, to join the said sections ing D between the said sectionsto render the x and form an edging-bead, substantiaily as de- Construction solid, substantially as described. serbed. In testimony whereof I have hereunto set 3. As a new article of nanuacture, a door myhand this 15th day of January, A. D. 1890. 5 eomposed of sheet-metal sections A and B, .7 T T each forming the one side of the door and ILLIAM KILBEAR' provided with strengthening-rails C, fianges 1 XVitnesses: A' and B', joined at their meeting edges and R. H. KINNEAR, eurved at the corners of the door, and a fi11- B. D. KINNEAR. 

